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Why does Fast Preview or Spec Preview fail to generate frames?

April 26, 2017fail fast frames preview Spec

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Why does Fast Preview or Spec Preview fail to generate frames?

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Some OpenGL video cards are unable to work with multiple processes. Try setting the OpenGL preview settings below the composition preview from ‘OpenGL – Always On’ to ‘Adaptive Resolution’. Ensure that the camera settings are set to ‘Active Camera’. That is the only view that After Effects allows for external previews such as Nucleo. If you are using After Effects 6.5 or 7.0.0 and have guide layers in your composition it will not preview.